CN109647989B - Drawing die and double-action press - Google Patents
Drawing die and double-action press Download PDFInfo
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- CN109647989B CN109647989B CN201910142136.9A CN201910142136A CN109647989B CN 109647989 B CN109647989 B CN 109647989B CN 201910142136 A CN201910142136 A CN 201910142136A CN 109647989 B CN109647989 B CN 109647989B
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- 238000003825 pressing Methods 0.000 claims abstract description 88
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 139
- 229910052757 nitrogen Inorganic materials 0.000 claims description 67
- 230000009471 action Effects 0.000 claims description 23
- 230000007704 transition Effects 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 16
- 239000011230 binding agent Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 11
- 230000007547 defect Effects 0.000 abstract description 4
- 230000001960 triggered effect Effects 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 description 18
- 239000011324 bead Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 6
- 229910001873 dinitrogen Inorganic materials 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 125000000174 L-prolyl group Chemical group [H]N1C([H])([H])C([H])([H])C([H])([H])[C@@]1([H])C(*)=O 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
- B21D37/12—Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/14—Particular arrangements for handling and holding in place complete dies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a drawing die, which relates to the field of machining and comprises a male die, a blank holder, a female die and a pressing component, wherein the pressing component is arranged at the overlapping part between the blank holder and the male die, the pressing component is firstly pressed before the male die contacts a blank, the pressure of the pressing component is transmitted to a pressing surface of the female die through the blank holder, and the pressing component is always kept in a pressing state in the whole male die forming process and can provide blank holder force, so that the blank is controlled to be uniformly fed, and the wrinkling defect is avoided. Meanwhile, the pressing assembly is arranged at the overlapping part between the blank holder and the male die, when the male die and the female die are closed, the spacing distance between the male die and the blank holder is reduced, the pressing assembly is triggered to press the blank holder to provide blank holder force, when the male die and the female die are separated, the spacing distance between the male die and the blank holder is increased, the pressing assembly is loosened, the blank holder force is removed, debugging is not needed, and the production efficiency is improved.
Description
Technical Field
The invention relates to the field of machining, in particular to a drawing die and a double-action press.
Background
The press is a common cold stamping device and is used as a working platform of a cold stamping die. The plate-shaped blank is drawn by a drawing die on a press machine to form a workpiece with a three-dimensional structure. In actual production, a workshop often has two kinds of presses, namely a single-action press and a double-action press, and the problem of switching the same drawing die between the single-action press and the double-action press needs to be considered for balancing the productivity of the workshop.
At present, after a drawing die which can be normally used on a single-action press is replaced on a double-action press, the condition of insufficient blank holding force can occur, so that blank feeding is not uniform, and wrinkling is generated. In the prior art, a draw bead is generally welded on a material pressing surface of a female die of a drawing die in a repair mode to increase the feeding resistance of a lateral blank, so that the feeding of the blank is balanced in the forming process, and the generation of wrinkles is reduced.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
the height of the draw bead on the pressure surface of the female die needs to be repeatedly debugged to produce qualified products, the debugging time is long, and the production efficiency is influenced.
Disclosure of Invention
The embodiment of the invention provides a drawing die which can provide enough blank holding force when being applied to a double-action press, and meanwhile, a drawing rib does not need to be welded on a material holding surface of a female die, so that the production efficiency can be improved. The technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides a drawing die, including: the male die and the female die are provided with mutually matched forming surfaces, the blank holder and the female die are provided with mutually matched pressing surfaces, the pressing surface of the female die is positioned at the periphery of the forming surface of the female die, and the pressing surface of the blank holder is positioned at the periphery of the forming surface of the male die; the drawing die further comprises a pressing component, the male die and the blank holder are partially overlapped in the closing direction of the male die and the female die, the pressing component is located between the overlapped parts of the male die and the blank holder, and the pressing component is configured to provide pressing force along the closing direction of the male die and the female die to the pressing surface of the blank holder when the male die and the female die are closed.
Further, the pressing assembly comprises an elastic component, and the elastic component is positioned on one side of the male die close to the female die or on one side of the blank holder far away from the female die.
Furthermore, the elastic component is a plurality of nitrogen springs which are parallel to each other, and the stretching direction of the nitrogen springs is the same as the closing direction of the male die and the female die.
Optionally, the compressing assembly further comprises an air pipe and an air pressure gauge, the plurality of nitrogen springs are connected in series through the air pipe, and the air pipe is connected with the air pressure gauge.
Optionally, the pressing assembly further includes a transition block, the transition block and the elastic component are arranged opposite to each other in the closing direction, and when the male die and the female die are closed, the transition block abuts against the elastic component.
Optionally, the male die comprises a male die body and a male die backing plate, one side of the male die body is fixed on the male die backing plate, the other side of the male die body is a forming surface of the male die, and the male die backing plate is partially overlapped with the blank holder.
Furthermore, guide structures which are matched with each other are arranged on the male die and the blank holder.
Optionally, the die is provided with a positioning piece, and the positioning piece is positioned on one side of the pressing surface of the die, which is far away from the forming surface of the die.
In a second aspect, embodiments of the present application provide a double action press including a draw die of the first aspect of the invention.
In a third aspect, embodiments of the present application provide a drawing die switching method for switching from a double-action press to a single-action press provided in the first aspect, the method including:
removing the drawing die from the double action press;
disassembling the pressing assembly;
mounting a female die on the slide block of the single-action press;
mounting a male die on the single press workbench;
mounting a blankholder on the single press table.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the blank holder and the male die are partially overlapped in the closing direction of the male die and the female die, the pressing component is arranged at the overlapping part between the blank holder and the male die, when the male die and the female die are closed, the pressing component is firstly pressed before the male die contacts a blank, and the pressure of the pressing component is transmitted to the pressing surface of the female die through the blank holder, so that the pressing force along the closing direction is provided for the pressing surface of the blank holder when the male die and the female die are closed, namely the blank holder force is provided, the blank is uniformly fed, the stability of the forming process is ensured, and the generation of wrinkling defects is avoided. Meanwhile, the pressing assembly is arranged at the overlapping part between the blank holder and the male die, when the male die and the female die are closed, the spacing distance between the male die and the blank holder is reduced, the pressing assembly is triggered to press the blank holder to provide blank holder force, when the male die and the female die are separated, the spacing distance between the male die and the blank holder is increased, the pressing assembly is loosened, the blank holder force is cancelled, the operation of repair welding or polishing of a draw bead on a drawing film is not needed, the debugging time is further reduced, and the production efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view showing a drawing die in a molding state according to the related art;
FIG. 2 is a schematic structural view of a drawing die with a double action press in a return stroke state according to an embodiment of the present invention;
FIG. 3 is a block diagram of a switching bolster and hold-down assembly of a drawing die in an embodiment of the invention;
FIG. 4 is a female die structure view of a car type tailgate drawing die;
FIG. 5 is a schematic diagram of a drawing die with a double action press in a closed binder configuration according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the construction of a drawing die with a double action press in a punch forming state according to an embodiment of the present invention;
FIG. 7 is a schematic illustration of the construction of a drawing die with a double action press in a closed punch configuration according to an embodiment of the present invention;
FIG. 8 is a flow chart of a method for converting a draw die provided by an embodiment of the present invention;
FIG. 9 is a schematic structural view of a drawing die with a single action press in a return stroke state according to an embodiment of the present invention;
fig. 10 is an enlarged view of a portion of fig. 9 in accordance with an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic view of a drawing die in a molding state in the related art. As shown in fig. 1, the drawing die includes: a male die 100, a blank holder 200 and a female die 300. The punch 100 has a molding surface 100a, the die 300 has a molding surface 300a, and the molding surface 100a and the molding surface 300a are matched with each other. The blank holder 200 has a swage face a, and the die 300 has a swage face B matching the swage face a. The pressing surface B of the female die 300 is positioned at the periphery of the molding surface 300a of the female die 300, and the pressing surface A of the blank holder 200 is positioned at the periphery of the molding surface 100a of the male die 100.
When in use, the male die 100 is arranged on the inner slide block 1 of the double-action press, the blank holder 200 is arranged on the outer slide block 2 of the double-action press, and the female die 300 is arranged on the workbench 3 of the double-action press. The blank 4 is placed on the female die 300, the outer sliding block 2 is controlled to drive the blank holder 200 to move downwards (namely move along the direction F in the drawing), and the blank holder force is provided through the material pressing face A and the material pressing face B to clamp the edge of the blank 4. And then controlling the inner slide block 1 to drive the male die 100 to move downwards until the male die and the female die 300 are closed, and finishing the drawing of the blank 4.
Because one end of the blank holder 200 of the double-action press is fixed on the outer slide block 2, and the end of the blank holder 200 corresponding to the pressing surface A is a free end, the stress is suspended, and the blank holder force provided by the blank holder 200 of the double-action press is insufficient. After the drawing is started, the blank 4 rapidly enters the die forming area from the area of the pressing surface B of the die 300, so that the workpiece is wrinkled and waste is generated. Therefore, the existing drawing die can repair-weld the semicircular bulge on the pressure surface B as the draw bead C. The draw bead C increases the resistance of the blank entering a forming area of the female die from a pressure surface of the female die, so that the feeding speed of the blank is reduced, and the generation of drawing wrinkles is reduced. However, the position and height of the draw bead C greatly affect the quality of draw forming, so that a lot of time is usually spent on debugging the draw bead C to produce qualified products, and the work efficiency is seriously affected. Meanwhile, when the drawing die is switched to the single-action press again, the drawing bead is required to be polished and reduced due to the fact that the drawing bead is not matched with the single-action press, debugging is carried out again, production cost is increased, production efficiency is affected, welding and polishing are repeatedly carried out, and the service life of the die can be seriously affected.
Therefore, the embodiment of the invention provides the drawing die which can compress the blank under the condition of not needing the drawing rib.
Fig. 2 is a schematic view of a drawing die return stroke state of the embodiment of the present invention. As shown in fig. 2, the drawing die provided by the present invention includes: male die 100, blank holder 200, female die 300, and hold-down assembly 400.
The punch 100 has a molding surface 100a, the die 300 has a molding surface 300a, and the molding surface 100a and the molding surface 300a are matched with each other. The blank holder 200 has a swage face a, and the die 300 has a swage face B matching the swage face a. The pressing surface B of the female die 300 is positioned at the periphery of the molding surface of the female die 300, and the pressing surface A of the blank holder 200 is positioned at the periphery of the molding surface of the male die 100.
In the closing direction F of the male die 100 and the female die 300, the blank holder 200 and the male die 100 are partially overlapped (as shown in fig. 2, the overlapped area of the blank holder 200 and the male die 100 is the D area). The hold-down assembly 400 is located between the overlapping portions of the holder 200 and the punch 100, and the hold-down assembly 400 is configured to provide a hold-down force to the hold-down face a of the holder 200 in the closing direction of the punch 100 and the die 300 when the punch 100 and the die 300 are closed.
When the punch press is used, the punch 100 can be arranged on the inner slide block 1 of the double-action press machine, the blank holder 200 is arranged on the outer slide block 2 of the double-action press machine, and the die 300 is arranged on the workbench 3 of the double-action press machine to provide support for blank forming. When the drawing starts, the outer slide block 2 drives the material pressing surface A of the blank holder 200 to be matched with the female die 300 and the material pressing surface B to press the blank 4; the male die 100 and the female die 300 are driven to close by the inner slide block 1, the pressing component 400 is firstly pressed before the male die 100 contacts the blank 4, and the pressing component can provide pressing force along the closing direction of the male die 100 and the female die 300 for the pressing surface A of the blank holder 200 in the closing process of the male die 100 and the female die 300; after the male die 100 and the female die 300 are closed, the drawing of the blank 4 is completed.
In the closing direction of the male die 100 and the female die 300, the blank holder 200 and the male die 100 are partially overlapped, the pressing assembly 400 is arranged at the overlapping part between the blank holder 200 and the male die 100, when the male die 100 and the female die 300 are closed, the pressing assembly 400 is firstly pressed before the male die 100 contacts the blank 4, and the pressing force of the pressing assembly 400 is transmitted to the pressing surface B of the female die 300 through the blank holder 200. Meanwhile, as the pressing assembly 400 is arranged at the overlapped part between the blank holder 200 and the male die 100, when the male die 100 and the female die 300 are closed, the spacing distance between the male die 100 and the blank holder 200 is reduced, the pressing assembly 400 is triggered to provide pressing force, when the male die 100 is separated from the female die 300, the spacing distance between the male die 100 and the blank holder 200 is increased, the pressing assembly 400 is loosened, the pressing force is cancelled, the operation of repair welding or polishing of a draw bead on the draw die is not needed, the debugging time is further reduced, and the production efficiency is improved.
As shown in fig. 2, the punch 100 may include a punch body 110 and a punch pad 120, one side of the punch body 110 is fixed to the punch pad 120, and the other side of the punch body 110 is a molding surface 100a of the punch 100. Alternatively, the punch body 110 may be locked to the punch backing plate 120 by screws. During design, the height of the male die body 110 is suitable for a single-action press, and the height of the male die body 110 can be adjusted through the male die base plate 120, so that the male die body is suitable for the stroke of an inner slide block of a double-action press, and the switching between the single-action press and the double-action press is realized.
The male die backing plate 120 is fixed on the inner slide block 1 of the double-acting machine tool, and the inner slide block 1 comprises an inner slide block body 11 and an inner slide block backing plate 12. The punch backing plate 120 may be fixed to the inner slide backing plate 12 by a holder of the machine tool, and the inner slide backing plate 12 may be fixed to the inner slide body 11 by a screw. The inner slide block 1 of the double-action press drives the punch body 110 and the punch backing plate 120 to move.
Alternatively, binder 200 may include a binder body 210 and a switching mat 220, with one side of switching mat 220 being connected to binder body 210 and the other side of switching mat 220 being connected to double action press outer slide 2. Alternatively, the blankholder body 210 may be fixed on the switching mat 220 by screws.
Alternatively, as shown in fig. 2, the outer slide 2 includes an outer slide body 21 and an outer slide pad 22. The switching base plate 220 is fixed on the outer slide base plate 22 through a clamp of the machine tool, the outer slide base plate 22 is fixed with the outer slide body 21 through a screw, and the outer slide 2 of the double-action press drives the blank holder body 210 and the switching base plate 220 to move.
FIG. 3 is a block diagram of a switching shim plate of a drawing die in an embodiment of the present invention. As shown in fig. 3, the switching shim 220 has a rectangular shape, and a through hole 220a through which the punch 100 passes is formed at the middle of the switching shim 220.
The switching plate 220 has a plurality of mounting holes 2201, and the mounting holes 2201 are internally provided with threads. When the drawing die is mounted on the double action press, the switching mat 220 is mounted on the outer slide 2 of the double action press by fitting the bolts into the mounting holes 2201. When the drawing die is mounted on the single-action press, the switching mat 220 is mounted on the table 6 of the single-action press by fitting the bolts into the mounting holes 2201.
For example, the plurality of mounting holes 2201 may be symmetrically arranged on opposite sides of the switching pad 220.
Optionally, the switching mat plate can also be provided with lightening holes. For example, as shown in fig. 3, the switching mat 220 also has a weight-reducing hole 2202 arranged in an array.
Further, the hold-down assembly 400 may include an elastic member located on a side of the punch 100 adjacent to the die 300 or on a side of the blankholder 200 away from the die 300. For example, in the embodiment shown in FIG. 2, the resilient member is located on the side of the blankholder 200 away from the female die 300.
In the present embodiment, the elastic member is a plurality of nitrogen springs 410 parallel to each other. The expansion and contraction direction of the nitrogen spring 410 is the same as the closing direction of the male mold 100 and the female mold 300. The nitrogen spring 410 is a member having an elastic function. It seals high pressure nitrogen in a definite container, and the nitrogen is compressed by external force through a plunger rod and expanded by the high pressure nitrogen to obtain a certain elastic pressure.
Alternatively, the nitrogen spring 410 may be detachably fixed to the switching shim plate 220 or the male shim plate 120 to facilitate the disassembly and assembly.
As shown in fig. 2 and 3, nitrogen spring 410 includes a fixed first end 401 and a compressible second end 402. Nitrogen spring 410 may be secured to switching shim plate 220 by a threaded hole in first end 401. Alternatively, the plurality of nitrogen springs 410 may be secured to the punch backing plate 120 by threaded holes in the first end 401.
When the drawing die needs to be switched to the single-action press, the switching from the double-action press to the single-action press can be completed only by detaching the nitrogen spring 410 and installing the drawing die on the single-action press. Therefore, the damage of the added welding draw bead to the molded surface of the drawing die of the single-action press can be avoided, and the debugging time for adjusting the draw bead can be saved.
In the present embodiment, the number of the nitrogen springs 410 can be obtained according to the total pressure required for the drawing die to draw and the length of the parting line of the side where the nitrogen springs 410 need to be arranged.
Alternatively, the number of nitrogen springs 410 may be determined according to the following steps:
firstly, calculating total pressure edge force required by drawing die drawing delay through CAE (Computer Aided Engineering) simulation forming software;
second step, passing through the formula
Estimating the edge pressing force T required by the side edge needing to be provided with the nitrogen springnWherein T is total pressure edge force required for drawing die drawing delay, LGeneral assemblyThe total parting line length of the drawing die, L n is the parting line length of the side edge where the nitrogen spring needs to be arranged;
thirdly, arranging the edge pressing force T required by the side edge of the nitrogen spring based on the requirementnAnd the existing specification of the nitrogen spring (i.e., the amount of pressure that can be provided) the number of nitrogen springs was calculated.
In the first step, CAE simulation forming software can be Unigraphics NX, Pro/ENGINEER and the like.
FIG. 4 is a female die structure diagram of a rear back door inner panel drawing die of a certain type, as shown in FIG. 4, B is a molding surface of the female die 300, the outline of the molding surface B is a parting line of the female die 300, L1 is the parting line length of the left side of the drawing die, L2 is the parting line length of the right side of the drawing die, L3 is the parting line length of the rear side of the drawing die, L4 is the parting line length of the front side of the drawing die, and the sum of the lengths of all the parting lines of the female die is the total parting line length of the drawing die.
Optionally, nitrogen spring 410 is 2-5 in number to provide a more uniform force on blankholder 200 and thus a uniform force transfer to nip surface A.
Referring again to fig. 3, further, a plurality of nitrogen springs 410 are evenly distributed parallel to the side 221 of the switching shim plate 220, the side 221 being the side of the switching shim plate 220 that is closer to the male mold 100.
Optionally, the distance between the nitrogen spring 410 and the side 221 of the switching cushion plate 220 is 20-30mm, so that the pressure provided by the nitrogen spring 410 is better transmitted to the pressure surface a and the pressure surface B, and wrinkling defects are avoided.
Further, a plurality of nitrogen springs 410 of the drawing die may be used individually, or a plurality of nitrogen springs 410 may be used in series with each other. When the plurality of nitrogen springs 410 of the drawing die are connected in series, as shown in fig. 2, the drawing die may further include a gas pipe 430 and a gas pressure gauge 440, the plurality of nitrogen springs 410 are connected in series through the gas pipe 430, and the gas pipe 430 is connected with the gas pressure gauge 440.
Alternatively, each of the nitrogen springs 410 has a nitrogen gas filling hole, and the gas pipe 430 includes a plurality of gas hoses, one end of each of which is connected to the nitrogen gas filling hole of one of the nitrogen springs 410, and the other end of each of which is connected to the other gas hose.
The gas pressure gauge 440 may be mounted outside the drawing die for easy viewing. Alternatively, as shown in FIG. 3, a gas pressure gauge 440 may be installed on the outside of the blankholder 200 to facilitate viewing the instant pressure value of the nitrogen spring 410.
Optionally, the drawing die may further include a nitrogen gas tank (not shown), and the gas pipe 430 is connected to the nitrogen gas tank. When the pressure value of the barometer 440 is observed not to correspond to the nominal value of the nitrogen spring 410, the nitrogen spring 410 can be charged through the nitrogen gas storage tank, so that the pressure value in the nitrogen spring 410 is adjusted to ensure that the nitrogen spring 410 can provide proper pressure and ensure the drawing quality.
Further, the pressing assembly 400 further includes a transition block 450, the transition block 450 is disposed opposite to the elastic member in the closing direction, and when the male mold 100 and the female mold 300 are closed, the transition block 450 abuts against the elastic member.
Alternatively, when the first end 401 of the nitrogen spring 410 is fixedly connected with the side of the switching shim plate 220 away from the binder 200, the transition block 450 is arranged at a position corresponding to the second end 402 of the nitrogen spring 410 on the side of the punch shim plate 120 close to the punch 100; when the first end 401 of the nitrogen spring 410 is fixedly connected to the side of the punch backing plate 120 close to the punch 100, the transition block 450 is disposed at a position corresponding to the second end 402 of the nitrogen spring 410 on the side of the switching backing plate 220 remote from the binder 200. The transition block 450 prevents the impact force of the second end 402 of the nitrogen spring 410 from directly acting on the switching shim plate 220 or the punch shim plate 120, causing damage locally.
Alternatively, the transition block 450 may be made of steel, for example, hardened and tempered steel. Illustratively, the material of the transition block 450 may be a quenched and tempered 45# steel. The 45# steel after quenching and tempering has good mechanical property and higher surface strength, can bear higher pressure and prevent local damage.
Further, the male die 100 and the blank holder 200 are provided with guide structures 130 which are matched with each other. In this embodiment, the guide 130 can be provided on the punch body 110 and the holder body 210.
Alternatively, the guide structure 130 may be a guide groove and a guide bar cooperating with each other to facilitate positioning of the punch 100 for better cooperation with the die 300 to complete the drawing of the blank 4. As shown in fig. 2, a guide groove is provided in the holder body 210, and a guide strip is provided on the punch body 110, the guide groove and the guide strip being slidably engaged in the closing direction F of the punch 100 and the die 300. Alternatively, it is also possible that the guide groove is provided on the punch body 110 and the guide strip is provided on the blank holder body 210.
Alternatively, the female die 300 and the blank holder 200 may be provided with guide structures which are engaged with each other. For example, the female die 300 is provided with a guide groove, the blank holder is provided with a guide strip, and the guide groove and the guide strip are slidably matched along the closing direction F of the male die 100 and the female die 300. Alternatively, it is also possible for the guide groove to be provided on the clamping ring and the guide strip to be provided on the female die.
Optionally, the concave die 300 is further provided with a positioning member 310, and the positioning member 310 is disposed on a side of the pressing surface B away from the concave die 300 and is parallel to a side of the pressing surface B. When the blank 4 is placed into the female die 300, the positioning member 310 can position the blank 4, so that the blank 4 is placed in place, and waste products are avoided.
Optionally, the side of the positioning member 310 close to the pressing surface B is a vertical wall so as to better abut against the end of the blank 4.
The operation of the drawing die mounted on a double action press will now be described with reference to figures 2, 5, 6 and 7.
As shown in fig. 2, the inner slide body 11 and the inner slide backing plate 12 drive the punch body 110 and the punch backing plate 120 to return, the outer slide body 21 and the outer slide backing plate 22 drive the blank holder body 210 and the switching backing plate 220 to return, the machine tool returns, the first end 401 of the nitrogen spring 410 is fixed on the switching backing plate 220, the second end 402 of the nitrogen spring 410 is not in contact with the transition block 450, and the stroke is released. In the machine tool return position, the blank 4 is placed in the die 300 and positioned by the positioning member 310.
FIG. 5 is a schematic diagram of a drawing die with a double action press in a closed binder configuration according to an embodiment of the present invention. As shown in fig. 5, the outer slider body 21 and the outer slider pad 22 drive the blank holder body 210 and the switching pad 220 to close along the closing direction F of the male die 100 and the female die 300, the blank holder body 210 and the female die 300 close, and the blank pressing surface a of the blank holder 200 cooperates with the blank pressing surface B of the female die 300 to press the blank 4.
FIG. 6 is a schematic diagram of the structure of a drawing die with a double action press in a punch forming state according to an embodiment of the present invention. As shown in fig. 6, the inner slide body 11 and the inner slide backing plate 12 drive the punch body 110 and the punch backing plate 120 to close along the closing direction F of the punch 100 and the die 300, and the pressing assembly 400 is pressed before the punch 100 contacts the blank 4, so that the pressing force of the pressing assembly 400 is transmitted to the pressing surface a and the pressing surface B through the blank holder 200, the stability of the forming process is ensured, and the blank 4 is controlled to be fed uniformly.
FIG. 7 is a schematic diagram of the construction of a drawing die with a double action press in the closed position of the punch in an embodiment of the invention. When the punch 100 and the die 300 are completely closed, the drawing of the blank 4 is completed, as shown in fig. 7. In the closing process of the male die 100 and the female die 300, the pressing component 400 is always kept in a pressing state, so that stable edge pressing force is provided for the pressing surface A and the pressing surface B, and good blank forming is ensured.
The present application also provides a double action press using the previously described drawing die, the double action press including an inner slide, an outer slide, a table and a drawing die. The structures of the inner slide block, the outer slide block, the workbench and the drawing die can be referred to the related description, and are not described in detail herein.
The operation of the double action press according to an embodiment of the present invention will now be described in detail with reference to fig. 2, 5, 6 and 7.
And (3) a return state:
as shown in fig. 2, the inner slide body 11 and the inner slide backing plate 12 drive the punch body 110 and the punch backing plate 120 to return, the outer slide body 21 and the outer slide backing plate 22 drive the blank holder body 210 and the switching backing plate 220 to return, the machine tool returns, the first end 401 of the nitrogen spring 410 is fixed on the switching backing plate 220, the second end 402 of the nitrogen spring 410 is not in contact with the transition block 450, and the stroke is released. In the machine tool return position, the blank 4 is placed in the die 300 and positioned by the positioning member 310.
The closed state of the blank holder:
as shown in fig. 5, the outer slider body 21 and the outer slider pad 22 drive the blank holder body 210 and the switching pad 220 to close along the closing direction F of the male die 100 and the female die 300, the blank holder body 210 and the female die 300 close, and the blank pressing surface a of the blank holder body 210 and the blank pressing surface B of the female die 300 cooperate to press the blank 4.
The male die is in a molding state:
as shown in fig. 6, the inner slide body 11 and the inner slide backing plate 12 drive the punch body 110 and the punch backing plate 120 to close along the closing direction F of the punch 100 and the die 300, before the punch body 110 contacts the blank 4, the transition block 450 on the punch backing plate 120 presses the second end 402 of the nitrogen spring 410 first, so that the pressure of the nitrogen spring 410 is transmitted to the pressing surface a and the pressing surface B through the switching backing plate 220 and the blank holder body 210, the stability of the forming process is ensured, and the balanced feeding of the blank 4 is controlled.
The closed state of the male die:
as shown in fig. 7, when the forming surface 100a of the punch 100 and the forming surface 300a of the die 300 completely coincide, the drawing of the blank 4 is completed. In the closing process of the male die 100 and the female die 300, the nitrogen spring 410 is always kept in a compressed state, so that stable blank pressing force is provided for the material pressing face A and the material pressing face B, and good blank forming is ensured.
Through setting up nitrogen spring 410 at the overlap portion between switching backing plate 220 and the terrace die backing plate 120, when terrace die body 110 and die 300 were closed, terrace die body 110 was before contacting blank 4, nitrogen spring 410 was compressed earlier, nitrogen spring 410's pressure passes through blank holder body 210 and transmits to on the pressure face B of die 300, because in whole blank forming process, nitrogen spring 410 remains compression state all the time, can provide the blank holder power, thereby control blank 4 feeding evenly, guarantee forming process's stability, avoid the production of wrinkling the defect. Meanwhile, since the nitrogen spring 410 is disposed between the switching cushion plate 220 and the punch cushion plate 120, when the punch body 110 and the die 300 are closed, the spacing distance between the punch body 110 and the switching cushion plate 220 is reduced, triggering the nitrogen spring to compress, and providing a blank holder force; when the male die body 110 returns, the spacing distance between the male die base plate 120 and the switching base plate 220 is increased, the nitrogen spring 410 is released, the blank holder force is cancelled, and the operation of repair welding or polishing of a draw bead on a draw film is not needed, so that the debugging time is reduced, and the production efficiency is improved.
FIG. 8 is a flow chart of a method for exchanging a drawing die, see FIG. 8, for switching the drawing die from a double action press to a single action press, according to an embodiment of the present invention, the method including:
s101, detaching the drawing die from the double-action press;
s102, dismounting the pressing component;
s103, mounting the female die on a slide block of a single-action press;
s104, mounting the male die on a workbench of a single-action press;
and S105, mounting the blank holder on a workbench of the single-action press.
FIG. 9 is a schematic structural view of a drawing die of a single-action press in a return stroke state in the embodiment of the invention. As shown in fig. 9, when the drawing die is switched to the single press, the blank holder 200 may be fixed on the single press table 6 by a tie plate. The pad may be the aforementioned switch pad 220 to reduce the number of pads and manufacturing cost.
Optionally, set screws 61 are used to secure the blankholder body 210 to the switching mat 220 to facilitate height adjustment of the blankholder body 210.
Fig. 10 is an enlarged view of a portion of fig. 9 in accordance with an embodiment of the present invention. As shown in fig. 9 and 10, optionally, a ram connecting column 62 is disposed on one side of the blank holder body 210 close to the nip surface a, a ram 63 is disposed on the single press workbench 6, the ram 63 extends out through a lightening hole 2202 to abut against the ram connecting column 62 in the closing direction of the punch 100 and the die 300, and the ram 63 transmits the air cushion force of the workbench 6 to the nip surface a region through the ram connecting column 62.
When the drawing die needs to be switched to the single-action press, the switching from the double-action press to the single-action press can be completed only by detaching the nitrogen spring 410 and inversely installing the convex-concave die of the drawing die on the single-action press, so that the damage of the added welding drawing rib to the molded surface of the drawing die of the single-action press can be avoided, and the debugging time for adjusting the drawing rib can be saved.
In addition, the steps for switching the drawing die from the single action press to the double action press are reversed from those shown in FIG. 8. The method comprises the following steps: removing the drawing die from the single-action press; installing a compression assembly; mounting the female die on a workbench of a double-action press; mounting a male die on an inner slide block of a double-action press; the blankholder was mounted on the outer slide of a double action press.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A drawing die, comprising: the punch die comprises a punch die (100), a blank holder (200) and a die (300), wherein the punch die (100) is suitable for being installed on an inner sliding block of a double-action press machine, the blank holder (200) is suitable for being installed on an outer sliding block of the double-action press machine, the die (300) is suitable for being installed on a workbench of the double-action press machine, the punch die (100) and the die (300) are provided with forming surfaces (100a and 300a) which are matched with each other, the blank holder (200) and the die (300) are provided with pressing surfaces (A, B) which are matched with each other, the pressing surface (B) of the die (300) is located on the periphery of the forming surface of the die (300), and the pressing surface (A) of the blank holder (200) is located on the periphery of the forming;
characterized in that it further comprises a hold-down assembly (400), in the closing direction of the male die (100) and the female die (300), the male die (100) and the binder (200) being partially overlapped, the hold-down assembly (400) being located between the overlapping portions of the male die (100) and the binder (200), the hold-down assembly (400) being configured to provide a hold-down force in the closing direction to a hold-down surface (A) of the binder (200) when the male die (100) and the female die (300) are closed,
the pressing assembly (400) comprises an elastic component, the elastic component is positioned on one side, close to the female die (300), of the male die (100) or on one side, far away from the female die (300), of the blank holder (200), the elastic component is a plurality of nitrogen springs (410) which are parallel to each other, the stretching direction of the nitrogen springs (410) is the same as the closing direction of the male die (100) and the female die (300),
the number of nitrogen springs (410) is determined in the following manner:
calculating the total pressure edge force required by the drawing time delay of the drawing die;
according to
Determining the blank holding force required for arranging the side edge of the nitrogen spring, wherein TnThe blank holder force required to arrange the sides of the nitrogen spring, T the total edge pressure required for drawing the die, LGeneral assemblyTotal split line length for drawing die, LnThe length of the parting line of the side where the nitrogen spring is arranged;
the number of nitrogen springs was calculated based on the blank holder force required to arrange the sides of the nitrogen springs and the specifications of the nitrogen springs.
2. The draw die of claim 1, wherein the hold-down assembly (400) further comprises a gas tube (430) and a gas pressure gauge (440), the plurality of nitrogen springs (410) being connected in series by the gas tube (430), the gas tube (430) being connected to the gas pressure gauge (440).
3. The drawing die according to claim 1, characterized in that the pressing assembly (400) further comprises a transition block (450), the transition block (450) being arranged opposite the elastic member in the closing direction, and the transition block (450) being against the elastic member when the male die (100) and the female die (300) are closed.
4. The drawing die according to any one of claims 1 to 3, wherein the punch (100) comprises a punch body (110) and a punch backing plate (120), one side of the punch body (110) is fixed on the punch backing plate (120), the other side of the punch body (110) is the forming surface (100a) of the punch (100), and the punch backing plate (120) is partially overlapped with the blank holder (200).
5. Drawing die according to any one of claims 1 to 3, characterised in that the male die (100) and the clamping ring (200) are provided with cooperating guide structures (130).
6. The drawing die according to any one of claims 1 to 3, characterized in that the female die (300) is provided with a positioning piece (310), and the positioning piece (310) is positioned on the side of the pressing surface (B) of the female die (300) away from the forming surface (300a) of the female die (300).
7. Double action press, characterized in that it comprises a drawing die according to any one of claims 1 to 6.
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| CN201910142136.9A CN109647989B (en) | 2019-02-26 | 2019-02-26 | Drawing die and double-action press |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910142136.9A CN109647989B (en) | 2019-02-26 | 2019-02-26 | Drawing die and double-action press |
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| CN109647989B true CN109647989B (en) | 2020-08-04 |
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| CN111687282A (en) * | 2020-05-25 | 2020-09-22 | 瑞鹄汽车模具股份有限公司 | Die drawing die single-double action switching method based on process data mining |
| CN117931959B (en) * | 2024-03-22 | 2024-06-21 | 季华实验室 | Drawing forming parameter acquisition method and machine tool determination method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58184024A (en) * | 1982-04-22 | 1983-10-27 | Nissan Motor Co Ltd | Drawing die |
| CN201279549Y (en) * | 2008-10-06 | 2009-07-29 | 广州普什精密模具有限公司 | Double-float drawing die for back seat-pan stamping piece of vehicle seat |
| CN101406917A (en) * | 2008-11-21 | 2009-04-15 | 四川成飞集成科技股份有限公司 | General-purpose drawing mold of single/double action press |
| CN103611814B (en) * | 2013-11-29 | 2016-03-16 | 河北金环模具有限公司 | A kind of three dynamic drawing dies |
| CN103846347B (en) * | 2014-03-15 | 2016-06-29 | 富士瑞鹄技研（芜湖）有限公司 | A kind of drawing die for plate forming |
| CN204381196U (en) * | 2014-12-22 | 2015-06-10 | 天津瑞驰兴模具有限公司 | A kind of Automobile Cover Drawing Die |
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